2 * Copyright (c) International Business Machines Corp., 2006
3 * Copyright (c) Nokia Corporation, 2007
5 * SPDX-License-Identifier: GPL-2.0+
7 * Author: Artem Bityutskiy (Битюцкий Артём),
12 * This file includes UBI initialization and building of UBI devices.
14 * When UBI is initialized, it attaches all the MTD devices specified as the
15 * module load parameters or the kernel boot parameters. If MTD devices were
16 * specified, UBI does not attach any MTD device, but it is possible to do
17 * later using the "UBI control device".
22 #include <linux/module.h>
23 #include <linux/moduleparam.h>
24 #include <linux/stringify.h>
25 #include <linux/namei.h>
26 #include <linux/stat.h>
27 #include <linux/miscdevice.h>
28 #include <linux/log2.h>
29 #include <linux/kthread.h>
30 #include <linux/kernel.h>
31 #include <linux/slab.h>
32 #include <linux/major.h>
34 #include <linux/compat.h>
36 #include <linux/err.h>
37 #include <ubi_uboot.h>
38 #include <linux/mtd/partitions.h>
42 /* Maximum length of the 'mtd=' parameter */
43 #define MTD_PARAM_LEN_MAX 64
45 /* Maximum number of comma-separated items in the 'mtd=' parameter */
46 #define MTD_PARAM_MAX_COUNT 4
48 /* Maximum value for the number of bad PEBs per 1024 PEBs */
49 #define MAX_MTD_UBI_BEB_LIMIT 768
51 #ifdef CONFIG_MTD_UBI_MODULE
52 #define ubi_is_module() 1
54 #define ubi_is_module() 0
57 #if (CONFIG_SYS_MALLOC_LEN < (512 << 10))
58 #error Malloc area too small for UBI, increase CONFIG_SYS_MALLOC_LEN to >= 512k
62 * struct mtd_dev_param - MTD device parameter description data structure.
63 * @name: MTD character device node path, MTD device name, or MTD device number
65 * @vid_hdr_offs: VID header offset
66 * @max_beb_per1024: maximum expected number of bad PEBs per 1024 PEBs
68 struct mtd_dev_param
{
69 char name
[MTD_PARAM_LEN_MAX
];
75 /* Numbers of elements set in the @mtd_dev_param array */
76 static int __initdata mtd_devs
;
78 /* MTD devices specification parameters */
79 static struct mtd_dev_param __initdata mtd_dev_param
[UBI_MAX_DEVICES
];
81 #ifdef CONFIG_MTD_UBI_FASTMAP
82 /* UBI module parameter to enable fastmap automatically on non-fastmap images */
83 static bool fm_autoconvert
;
86 #ifdef CONFIG_MTD_UBI_FASTMAP
87 #if !defined(CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT)
88 #define CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT 0
90 static bool fm_autoconvert
= CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT
;
93 /* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
94 struct class *ubi_class
;
96 /* Slab cache for wear-leveling entries */
97 struct kmem_cache
*ubi_wl_entry_slab
;
100 /* UBI control character device */
101 static struct miscdevice ubi_ctrl_cdev
= {
102 .minor
= MISC_DYNAMIC_MINOR
,
104 .fops
= &ubi_ctrl_cdev_operations
,
108 /* All UBI devices in system */
110 static struct ubi_device
*ubi_devices
[UBI_MAX_DEVICES
];
112 struct ubi_device
*ubi_devices
[UBI_MAX_DEVICES
];
116 /* Serializes UBI devices creations and removals */
117 DEFINE_MUTEX(ubi_devices_mutex
);
119 /* Protects @ubi_devices and @ubi->ref_count */
120 static DEFINE_SPINLOCK(ubi_devices_lock
);
122 /* "Show" method for files in '/<sysfs>/class/ubi/' */
123 static ssize_t
ubi_version_show(struct class *class,
124 struct class_attribute
*attr
, char *buf
)
126 return sprintf(buf
, "%d\n", UBI_VERSION
);
129 /* UBI version attribute ('/<sysfs>/class/ubi/version') */
130 static struct class_attribute ubi_version
=
131 __ATTR(version
, S_IRUGO
, ubi_version_show
, NULL
);
133 static ssize_t
dev_attribute_show(struct device
*dev
,
134 struct device_attribute
*attr
, char *buf
);
136 /* UBI device attributes (correspond to files in '/<sysfs>/class/ubi/ubiX') */
137 static struct device_attribute dev_eraseblock_size
=
138 __ATTR(eraseblock_size
, S_IRUGO
, dev_attribute_show
, NULL
);
139 static struct device_attribute dev_avail_eraseblocks
=
140 __ATTR(avail_eraseblocks
, S_IRUGO
, dev_attribute_show
, NULL
);
141 static struct device_attribute dev_total_eraseblocks
=
142 __ATTR(total_eraseblocks
, S_IRUGO
, dev_attribute_show
, NULL
);
143 static struct device_attribute dev_volumes_count
=
144 __ATTR(volumes_count
, S_IRUGO
, dev_attribute_show
, NULL
);
145 static struct device_attribute dev_max_ec
=
146 __ATTR(max_ec
, S_IRUGO
, dev_attribute_show
, NULL
);
147 static struct device_attribute dev_reserved_for_bad
=
148 __ATTR(reserved_for_bad
, S_IRUGO
, dev_attribute_show
, NULL
);
149 static struct device_attribute dev_bad_peb_count
=
150 __ATTR(bad_peb_count
, S_IRUGO
, dev_attribute_show
, NULL
);
151 static struct device_attribute dev_max_vol_count
=
152 __ATTR(max_vol_count
, S_IRUGO
, dev_attribute_show
, NULL
);
153 static struct device_attribute dev_min_io_size
=
154 __ATTR(min_io_size
, S_IRUGO
, dev_attribute_show
, NULL
);
155 static struct device_attribute dev_bgt_enabled
=
156 __ATTR(bgt_enabled
, S_IRUGO
, dev_attribute_show
, NULL
);
157 static struct device_attribute dev_mtd_num
=
158 __ATTR(mtd_num
, S_IRUGO
, dev_attribute_show
, NULL
);
162 * ubi_volume_notify - send a volume change notification.
163 * @ubi: UBI device description object
164 * @vol: volume description object of the changed volume
165 * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc)
167 * This is a helper function which notifies all subscribers about a volume
168 * change event (creation, removal, re-sizing, re-naming, updating). Returns
169 * zero in case of success and a negative error code in case of failure.
171 int ubi_volume_notify(struct ubi_device
*ubi
, struct ubi_volume
*vol
, int ntype
)
173 struct ubi_notification nt
;
175 ubi_do_get_device_info(ubi
, &nt
.di
);
176 ubi_do_get_volume_info(ubi
, vol
, &nt
.vi
);
178 #ifdef CONFIG_MTD_UBI_FASTMAP
180 case UBI_VOLUME_ADDED
:
181 case UBI_VOLUME_REMOVED
:
182 case UBI_VOLUME_RESIZED
:
183 case UBI_VOLUME_RENAMED
:
184 if (ubi_update_fastmap(ubi
)) {
185 ubi_err("Unable to update fastmap!");
190 return blocking_notifier_call_chain(&ubi_notifiers
, ntype
, &nt
);
194 * ubi_notify_all - send a notification to all volumes.
195 * @ubi: UBI device description object
196 * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc)
197 * @nb: the notifier to call
199 * This function walks all volumes of UBI device @ubi and sends the @ntype
200 * notification for each volume. If @nb is %NULL, then all registered notifiers
201 * are called, otherwise only the @nb notifier is called. Returns the number of
202 * sent notifications.
204 int ubi_notify_all(struct ubi_device
*ubi
, int ntype
, struct notifier_block
*nb
)
206 struct ubi_notification nt
;
212 ubi_do_get_device_info(ubi
, &nt
.di
);
214 mutex_lock(&ubi
->device_mutex
);
215 for (i
= 0; i
< ubi
->vtbl_slots
; i
++) {
217 * Since the @ubi->device is locked, and we are not going to
218 * change @ubi->volumes, we do not have to lock
219 * @ubi->volumes_lock.
221 if (!ubi
->volumes
[i
])
224 ubi_do_get_volume_info(ubi
, ubi
->volumes
[i
], &nt
.vi
);
227 nb
->notifier_call(nb
, ntype
, &nt
);
229 ret
= blocking_notifier_call_chain(&ubi_notifiers
, ntype
,
234 mutex_unlock(&ubi
->device_mutex
);
240 * ubi_enumerate_volumes - send "add" notification for all existing volumes.
241 * @nb: the notifier to call
243 * This function walks all UBI devices and volumes and sends the
244 * %UBI_VOLUME_ADDED notification for each volume. If @nb is %NULL, then all
245 * registered notifiers are called, otherwise only the @nb notifier is called.
246 * Returns the number of sent notifications.
248 int ubi_enumerate_volumes(struct notifier_block
*nb
)
253 * Since the @ubi_devices_mutex is locked, and we are not going to
254 * change @ubi_devices, we do not have to lock @ubi_devices_lock.
256 for (i
= 0; i
< UBI_MAX_DEVICES
; i
++) {
257 struct ubi_device
*ubi
= ubi_devices
[i
];
261 count
+= ubi_notify_all(ubi
, UBI_VOLUME_ADDED
, nb
);
268 * ubi_get_device - get UBI device.
269 * @ubi_num: UBI device number
271 * This function returns UBI device description object for UBI device number
272 * @ubi_num, or %NULL if the device does not exist. This function increases the
273 * device reference count to prevent removal of the device. In other words, the
274 * device cannot be removed if its reference count is not zero.
276 struct ubi_device
*ubi_get_device(int ubi_num
)
278 struct ubi_device
*ubi
;
280 spin_lock(&ubi_devices_lock
);
281 ubi
= ubi_devices
[ubi_num
];
283 ubi_assert(ubi
->ref_count
>= 0);
285 get_device(&ubi
->dev
);
287 spin_unlock(&ubi_devices_lock
);
293 * ubi_put_device - drop an UBI device reference.
294 * @ubi: UBI device description object
296 void ubi_put_device(struct ubi_device
*ubi
)
298 spin_lock(&ubi_devices_lock
);
300 put_device(&ubi
->dev
);
301 spin_unlock(&ubi_devices_lock
);
305 * ubi_get_by_major - get UBI device by character device major number.
306 * @major: major number
308 * This function is similar to 'ubi_get_device()', but it searches the device
309 * by its major number.
311 struct ubi_device
*ubi_get_by_major(int major
)
314 struct ubi_device
*ubi
;
316 spin_lock(&ubi_devices_lock
);
317 for (i
= 0; i
< UBI_MAX_DEVICES
; i
++) {
318 ubi
= ubi_devices
[i
];
319 if (ubi
&& MAJOR(ubi
->cdev
.dev
) == major
) {
320 ubi_assert(ubi
->ref_count
>= 0);
322 get_device(&ubi
->dev
);
323 spin_unlock(&ubi_devices_lock
);
327 spin_unlock(&ubi_devices_lock
);
333 * ubi_major2num - get UBI device number by character device major number.
334 * @major: major number
336 * This function searches UBI device number object by its major number. If UBI
337 * device was not found, this function returns -ENODEV, otherwise the UBI device
338 * number is returned.
340 int ubi_major2num(int major
)
342 int i
, ubi_num
= -ENODEV
;
344 spin_lock(&ubi_devices_lock
);
345 for (i
= 0; i
< UBI_MAX_DEVICES
; i
++) {
346 struct ubi_device
*ubi
= ubi_devices
[i
];
348 if (ubi
&& MAJOR(ubi
->cdev
.dev
) == major
) {
349 ubi_num
= ubi
->ubi_num
;
353 spin_unlock(&ubi_devices_lock
);
359 /* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */
360 static ssize_t
dev_attribute_show(struct device
*dev
,
361 struct device_attribute
*attr
, char *buf
)
364 struct ubi_device
*ubi
;
367 * The below code looks weird, but it actually makes sense. We get the
368 * UBI device reference from the contained 'struct ubi_device'. But it
369 * is unclear if the device was removed or not yet. Indeed, if the
370 * device was removed before we increased its reference count,
371 * 'ubi_get_device()' will return -ENODEV and we fail.
373 * Remember, 'struct ubi_device' is freed in the release function, so
374 * we still can use 'ubi->ubi_num'.
376 ubi
= container_of(dev
, struct ubi_device
, dev
);
377 ubi
= ubi_get_device(ubi
->ubi_num
);
381 if (attr
== &dev_eraseblock_size
)
382 ret
= sprintf(buf
, "%d\n", ubi
->leb_size
);
383 else if (attr
== &dev_avail_eraseblocks
)
384 ret
= sprintf(buf
, "%d\n", ubi
->avail_pebs
);
385 else if (attr
== &dev_total_eraseblocks
)
386 ret
= sprintf(buf
, "%d\n", ubi
->good_peb_count
);
387 else if (attr
== &dev_volumes_count
)
388 ret
= sprintf(buf
, "%d\n", ubi
->vol_count
- UBI_INT_VOL_COUNT
);
389 else if (attr
== &dev_max_ec
)
390 ret
= sprintf(buf
, "%d\n", ubi
->max_ec
);
391 else if (attr
== &dev_reserved_for_bad
)
392 ret
= sprintf(buf
, "%d\n", ubi
->beb_rsvd_pebs
);
393 else if (attr
== &dev_bad_peb_count
)
394 ret
= sprintf(buf
, "%d\n", ubi
->bad_peb_count
);
395 else if (attr
== &dev_max_vol_count
)
396 ret
= sprintf(buf
, "%d\n", ubi
->vtbl_slots
);
397 else if (attr
== &dev_min_io_size
)
398 ret
= sprintf(buf
, "%d\n", ubi
->min_io_size
);
399 else if (attr
== &dev_bgt_enabled
)
400 ret
= sprintf(buf
, "%d\n", ubi
->thread_enabled
);
401 else if (attr
== &dev_mtd_num
)
402 ret
= sprintf(buf
, "%d\n", ubi
->mtd
->index
);
410 static void dev_release(struct device
*dev
)
412 struct ubi_device
*ubi
= container_of(dev
, struct ubi_device
, dev
);
418 * ubi_sysfs_init - initialize sysfs for an UBI device.
419 * @ubi: UBI device description object
420 * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was
423 * This function returns zero in case of success and a negative error code in
426 static int ubi_sysfs_init(struct ubi_device
*ubi
, int *ref
)
430 ubi
->dev
.release
= dev_release
;
431 ubi
->dev
.devt
= ubi
->cdev
.dev
;
432 ubi
->dev
.class = ubi_class
;
433 dev_set_name(&ubi
->dev
, UBI_NAME_STR
"%d", ubi
->ubi_num
);
434 err
= device_register(&ubi
->dev
);
439 err
= device_create_file(&ubi
->dev
, &dev_eraseblock_size
);
442 err
= device_create_file(&ubi
->dev
, &dev_avail_eraseblocks
);
445 err
= device_create_file(&ubi
->dev
, &dev_total_eraseblocks
);
448 err
= device_create_file(&ubi
->dev
, &dev_volumes_count
);
451 err
= device_create_file(&ubi
->dev
, &dev_max_ec
);
454 err
= device_create_file(&ubi
->dev
, &dev_reserved_for_bad
);
457 err
= device_create_file(&ubi
->dev
, &dev_bad_peb_count
);
460 err
= device_create_file(&ubi
->dev
, &dev_max_vol_count
);
463 err
= device_create_file(&ubi
->dev
, &dev_min_io_size
);
466 err
= device_create_file(&ubi
->dev
, &dev_bgt_enabled
);
469 err
= device_create_file(&ubi
->dev
, &dev_mtd_num
);
474 * ubi_sysfs_close - close sysfs for an UBI device.
475 * @ubi: UBI device description object
477 static void ubi_sysfs_close(struct ubi_device
*ubi
)
479 device_remove_file(&ubi
->dev
, &dev_mtd_num
);
480 device_remove_file(&ubi
->dev
, &dev_bgt_enabled
);
481 device_remove_file(&ubi
->dev
, &dev_min_io_size
);
482 device_remove_file(&ubi
->dev
, &dev_max_vol_count
);
483 device_remove_file(&ubi
->dev
, &dev_bad_peb_count
);
484 device_remove_file(&ubi
->dev
, &dev_reserved_for_bad
);
485 device_remove_file(&ubi
->dev
, &dev_max_ec
);
486 device_remove_file(&ubi
->dev
, &dev_volumes_count
);
487 device_remove_file(&ubi
->dev
, &dev_total_eraseblocks
);
488 device_remove_file(&ubi
->dev
, &dev_avail_eraseblocks
);
489 device_remove_file(&ubi
->dev
, &dev_eraseblock_size
);
490 device_unregister(&ubi
->dev
);
495 * kill_volumes - destroy all user volumes.
496 * @ubi: UBI device description object
498 static void kill_volumes(struct ubi_device
*ubi
)
502 for (i
= 0; i
< ubi
->vtbl_slots
; i
++)
504 ubi_free_volume(ubi
, ubi
->volumes
[i
]);
508 * uif_init - initialize user interfaces for an UBI device.
509 * @ubi: UBI device description object
510 * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was
511 * taken, otherwise set to %0
513 * This function initializes various user interfaces for an UBI device. If the
514 * initialization fails at an early stage, this function frees all the
515 * resources it allocated, returns an error, and @ref is set to %0. However,
516 * if the initialization fails after the UBI device was registered in the
517 * driver core subsystem, this function takes a reference to @ubi->dev, because
518 * otherwise the release function ('dev_release()') would free whole @ubi
519 * object. The @ref argument is set to %1 in this case. The caller has to put
522 * This function returns zero in case of success and a negative error code in
525 static int uif_init(struct ubi_device
*ubi
, int *ref
)
533 sprintf(ubi
->ubi_name
, UBI_NAME_STR
"%d", ubi
->ubi_num
);
536 * Major numbers for the UBI character devices are allocated
537 * dynamically. Major numbers of volume character devices are
538 * equivalent to ones of the corresponding UBI character device. Minor
539 * numbers of UBI character devices are 0, while minor numbers of
540 * volume character devices start from 1. Thus, we allocate one major
541 * number and ubi->vtbl_slots + 1 minor numbers.
543 err
= alloc_chrdev_region(&dev
, 0, ubi
->vtbl_slots
+ 1, ubi
->ubi_name
);
545 ubi_err("cannot register UBI character devices");
549 ubi_assert(MINOR(dev
) == 0);
550 cdev_init(&ubi
->cdev
, &ubi_cdev_operations
);
551 dbg_gen("%s major is %u", ubi
->ubi_name
, MAJOR(dev
));
552 ubi
->cdev
.owner
= THIS_MODULE
;
554 err
= cdev_add(&ubi
->cdev
, dev
, 1);
556 ubi_err("cannot add character device");
560 err
= ubi_sysfs_init(ubi
, ref
);
564 for (i
= 0; i
< ubi
->vtbl_slots
; i
++)
565 if (ubi
->volumes
[i
]) {
566 err
= ubi_add_volume(ubi
, ubi
->volumes
[i
]);
568 ubi_err("cannot add volume %d", i
);
579 get_device(&ubi
->dev
);
580 ubi_sysfs_close(ubi
);
581 cdev_del(&ubi
->cdev
);
583 unregister_chrdev_region(ubi
->cdev
.dev
, ubi
->vtbl_slots
+ 1);
584 ubi_err("cannot initialize UBI %s, error %d", ubi
->ubi_name
, err
);
589 * uif_close - close user interfaces for an UBI device.
590 * @ubi: UBI device description object
592 * Note, since this function un-registers UBI volume device objects (@vol->dev),
593 * the memory allocated voe the volumes is freed as well (in the release
596 static void uif_close(struct ubi_device
*ubi
)
599 ubi_sysfs_close(ubi
);
600 cdev_del(&ubi
->cdev
);
601 unregister_chrdev_region(ubi
->cdev
.dev
, ubi
->vtbl_slots
+ 1);
605 * ubi_free_internal_volumes - free internal volumes.
606 * @ubi: UBI device description object
608 void ubi_free_internal_volumes(struct ubi_device
*ubi
)
612 for (i
= ubi
->vtbl_slots
;
613 i
< ubi
->vtbl_slots
+ UBI_INT_VOL_COUNT
; i
++) {
614 kfree(ubi
->volumes
[i
]->eba_tbl
);
615 kfree(ubi
->volumes
[i
]);
619 static int get_bad_peb_limit(const struct ubi_device
*ubi
, int max_beb_per1024
)
621 int limit
, device_pebs
;
622 uint64_t device_size
;
624 if (!max_beb_per1024
)
628 * Here we are using size of the entire flash chip and
629 * not just the MTD partition size because the maximum
630 * number of bad eraseblocks is a percentage of the
631 * whole device and bad eraseblocks are not fairly
632 * distributed over the flash chip. So the worst case
633 * is that all the bad eraseblocks of the chip are in
634 * the MTD partition we are attaching (ubi->mtd).
636 device_size
= mtd_get_device_size(ubi
->mtd
);
637 device_pebs
= mtd_div_by_eb(device_size
, ubi
->mtd
);
638 limit
= mult_frac(device_pebs
, max_beb_per1024
, 1024);
641 if (mult_frac(limit
, 1024, max_beb_per1024
) < device_pebs
)
648 * io_init - initialize I/O sub-system for a given UBI device.
649 * @ubi: UBI device description object
650 * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
652 * If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are
654 * o EC header is always at offset zero - this cannot be changed;
655 * o VID header starts just after the EC header at the closest address
656 * aligned to @io->hdrs_min_io_size;
657 * o data starts just after the VID header at the closest address aligned to
660 * This function returns zero in case of success and a negative error code in
663 static int io_init(struct ubi_device
*ubi
, int max_beb_per1024
)
665 dbg_gen("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb
));
666 dbg_gen("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry
));
668 if (ubi
->mtd
->numeraseregions
!= 0) {
670 * Some flashes have several erase regions. Different regions
671 * may have different eraseblock size and other
672 * characteristics. It looks like mostly multi-region flashes
673 * have one "main" region and one or more small regions to
674 * store boot loader code or boot parameters or whatever. I
675 * guess we should just pick the largest region. But this is
678 ubi_err("multiple regions, not implemented");
682 if (ubi
->vid_hdr_offset
< 0)
686 * Note, in this implementation we support MTD devices with 0x7FFFFFFF
687 * physical eraseblocks maximum.
690 ubi
->peb_size
= ubi
->mtd
->erasesize
;
691 ubi
->peb_count
= mtd_div_by_eb(ubi
->mtd
->size
, ubi
->mtd
);
692 ubi
->flash_size
= ubi
->mtd
->size
;
694 if (mtd_can_have_bb(ubi
->mtd
)) {
695 ubi
->bad_allowed
= 1;
696 ubi
->bad_peb_limit
= get_bad_peb_limit(ubi
, max_beb_per1024
);
699 if (ubi
->mtd
->type
== MTD_NORFLASH
) {
700 ubi_assert(ubi
->mtd
->writesize
== 1);
704 ubi
->min_io_size
= ubi
->mtd
->writesize
;
705 ubi
->hdrs_min_io_size
= ubi
->mtd
->writesize
>> ubi
->mtd
->subpage_sft
;
708 * Make sure minimal I/O unit is power of 2. Note, there is no
709 * fundamental reason for this assumption. It is just an optimization
710 * which allows us to avoid costly division operations.
712 if (!is_power_of_2(ubi
->min_io_size
)) {
713 ubi_err("min. I/O unit (%d) is not power of 2",
718 ubi_assert(ubi
->hdrs_min_io_size
> 0);
719 ubi_assert(ubi
->hdrs_min_io_size
<= ubi
->min_io_size
);
720 ubi_assert(ubi
->min_io_size
% ubi
->hdrs_min_io_size
== 0);
722 ubi
->max_write_size
= ubi
->mtd
->writebufsize
;
724 * Maximum write size has to be greater or equivalent to min. I/O
725 * size, and be multiple of min. I/O size.
727 if (ubi
->max_write_size
< ubi
->min_io_size
||
728 ubi
->max_write_size
% ubi
->min_io_size
||
729 !is_power_of_2(ubi
->max_write_size
)) {
730 ubi_err("bad write buffer size %d for %d min. I/O unit",
731 ubi
->max_write_size
, ubi
->min_io_size
);
735 /* Calculate default aligned sizes of EC and VID headers */
736 ubi
->ec_hdr_alsize
= ALIGN(UBI_EC_HDR_SIZE
, ubi
->hdrs_min_io_size
);
737 ubi
->vid_hdr_alsize
= ALIGN(UBI_VID_HDR_SIZE
, ubi
->hdrs_min_io_size
);
739 dbg_gen("min_io_size %d", ubi
->min_io_size
);
740 dbg_gen("max_write_size %d", ubi
->max_write_size
);
741 dbg_gen("hdrs_min_io_size %d", ubi
->hdrs_min_io_size
);
742 dbg_gen("ec_hdr_alsize %d", ubi
->ec_hdr_alsize
);
743 dbg_gen("vid_hdr_alsize %d", ubi
->vid_hdr_alsize
);
745 if (ubi
->vid_hdr_offset
== 0)
747 ubi
->vid_hdr_offset
= ubi
->vid_hdr_aloffset
=
750 ubi
->vid_hdr_aloffset
= ubi
->vid_hdr_offset
&
751 ~(ubi
->hdrs_min_io_size
- 1);
752 ubi
->vid_hdr_shift
= ubi
->vid_hdr_offset
-
753 ubi
->vid_hdr_aloffset
;
756 /* Similar for the data offset */
757 ubi
->leb_start
= ubi
->vid_hdr_offset
+ UBI_VID_HDR_SIZE
;
758 ubi
->leb_start
= ALIGN(ubi
->leb_start
, ubi
->min_io_size
);
760 dbg_gen("vid_hdr_offset %d", ubi
->vid_hdr_offset
);
761 dbg_gen("vid_hdr_aloffset %d", ubi
->vid_hdr_aloffset
);
762 dbg_gen("vid_hdr_shift %d", ubi
->vid_hdr_shift
);
763 dbg_gen("leb_start %d", ubi
->leb_start
);
765 /* The shift must be aligned to 32-bit boundary */
766 if (ubi
->vid_hdr_shift
% 4) {
767 ubi_err("unaligned VID header shift %d",
773 if (ubi
->vid_hdr_offset
< UBI_EC_HDR_SIZE
||
774 ubi
->leb_start
< ubi
->vid_hdr_offset
+ UBI_VID_HDR_SIZE
||
775 ubi
->leb_start
> ubi
->peb_size
- UBI_VID_HDR_SIZE
||
776 ubi
->leb_start
& (ubi
->min_io_size
- 1)) {
777 ubi_err("bad VID header (%d) or data offsets (%d)",
778 ubi
->vid_hdr_offset
, ubi
->leb_start
);
783 * Set maximum amount of physical erroneous eraseblocks to be 10%.
784 * Erroneous PEB are those which have read errors.
786 ubi
->max_erroneous
= ubi
->peb_count
/ 10;
787 if (ubi
->max_erroneous
< 16)
788 ubi
->max_erroneous
= 16;
789 dbg_gen("max_erroneous %d", ubi
->max_erroneous
);
792 * It may happen that EC and VID headers are situated in one minimal
793 * I/O unit. In this case we can only accept this UBI image in
796 if (ubi
->vid_hdr_offset
+ UBI_VID_HDR_SIZE
<= ubi
->hdrs_min_io_size
) {
797 ubi_warn("EC and VID headers are in the same minimal I/O unit, switch to read-only mode");
801 ubi
->leb_size
= ubi
->peb_size
- ubi
->leb_start
;
803 if (!(ubi
->mtd
->flags
& MTD_WRITEABLE
)) {
804 ubi_msg("MTD device %d is write-protected, attach in read-only mode",
810 * Note, ideally, we have to initialize @ubi->bad_peb_count here. But
811 * unfortunately, MTD does not provide this information. We should loop
812 * over all physical eraseblocks and invoke mtd->block_is_bad() for
813 * each physical eraseblock. So, we leave @ubi->bad_peb_count
814 * uninitialized so far.
821 * autoresize - re-size the volume which has the "auto-resize" flag set.
822 * @ubi: UBI device description object
823 * @vol_id: ID of the volume to re-size
825 * This function re-sizes the volume marked by the %UBI_VTBL_AUTORESIZE_FLG in
826 * the volume table to the largest possible size. See comments in ubi-header.h
827 * for more description of the flag. Returns zero in case of success and a
828 * negative error code in case of failure.
830 static int autoresize(struct ubi_device
*ubi
, int vol_id
)
832 struct ubi_volume_desc desc
;
833 struct ubi_volume
*vol
= ubi
->volumes
[vol_id
];
834 int err
, old_reserved_pebs
= vol
->reserved_pebs
;
837 ubi_warn("skip auto-resize because of R/O mode");
842 * Clear the auto-resize flag in the volume in-memory copy of the
843 * volume table, and 'ubi_resize_volume()' will propagate this change
846 ubi
->vtbl
[vol_id
].flags
&= ~UBI_VTBL_AUTORESIZE_FLG
;
848 if (ubi
->avail_pebs
== 0) {
849 struct ubi_vtbl_record vtbl_rec
;
852 * No available PEBs to re-size the volume, clear the flag on
855 vtbl_rec
= ubi
->vtbl
[vol_id
];
856 err
= ubi_change_vtbl_record(ubi
, vol_id
, &vtbl_rec
);
858 ubi_err("cannot clean auto-resize flag for volume %d",
862 err
= ubi_resize_volume(&desc
,
863 old_reserved_pebs
+ ubi
->avail_pebs
);
865 ubi_err("cannot auto-resize volume %d", vol_id
);
871 ubi_msg("volume %d (\"%s\") re-sized from %d to %d LEBs", vol_id
,
872 vol
->name
, old_reserved_pebs
, vol
->reserved_pebs
);
877 * ubi_attach_mtd_dev - attach an MTD device.
878 * @mtd: MTD device description object
879 * @ubi_num: number to assign to the new UBI device
880 * @vid_hdr_offset: VID header offset
881 * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
883 * This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number
884 * to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in
885 * which case this function finds a vacant device number and assigns it
886 * automatically. Returns the new UBI device number in case of success and a
887 * negative error code in case of failure.
889 * Note, the invocations of this function has to be serialized by the
890 * @ubi_devices_mutex.
892 int ubi_attach_mtd_dev(struct mtd_info
*mtd
, int ubi_num
,
893 int vid_hdr_offset
, int max_beb_per1024
)
895 struct ubi_device
*ubi
;
898 if (max_beb_per1024
< 0 || max_beb_per1024
> MAX_MTD_UBI_BEB_LIMIT
)
901 if (!max_beb_per1024
)
902 max_beb_per1024
= CONFIG_MTD_UBI_BEB_LIMIT
;
905 * Check if we already have the same MTD device attached.
907 * Note, this function assumes that UBI devices creations and deletions
908 * are serialized, so it does not take the &ubi_devices_lock.
910 for (i
= 0; i
< UBI_MAX_DEVICES
; i
++) {
911 ubi
= ubi_devices
[i
];
912 if (ubi
&& mtd
->index
== ubi
->mtd
->index
) {
913 ubi_err("mtd%d is already attached to ubi%d",
920 * Make sure this MTD device is not emulated on top of an UBI volume
921 * already. Well, generally this recursion works fine, but there are
922 * different problems like the UBI module takes a reference to itself
923 * by attaching (and thus, opening) the emulated MTD device. This
924 * results in inability to unload the module. And in general it makes
925 * no sense to attach emulated MTD devices, so we prohibit this.
927 if (mtd
->type
== MTD_UBIVOLUME
) {
928 ubi_err("refuse attaching mtd%d - it is already emulated on top of UBI",
933 if (ubi_num
== UBI_DEV_NUM_AUTO
) {
934 /* Search for an empty slot in the @ubi_devices array */
935 for (ubi_num
= 0; ubi_num
< UBI_MAX_DEVICES
; ubi_num
++)
936 if (!ubi_devices
[ubi_num
])
938 if (ubi_num
== UBI_MAX_DEVICES
) {
939 ubi_err("only %d UBI devices may be created",
944 if (ubi_num
>= UBI_MAX_DEVICES
)
947 /* Make sure ubi_num is not busy */
948 if (ubi_devices
[ubi_num
]) {
949 ubi_err("ubi%d already exists", ubi_num
);
954 ubi
= kzalloc(sizeof(struct ubi_device
), GFP_KERNEL
);
959 ubi
->ubi_num
= ubi_num
;
960 ubi
->vid_hdr_offset
= vid_hdr_offset
;
961 ubi
->autoresize_vol_id
= -1;
963 #ifdef CONFIG_MTD_UBI_FASTMAP
964 ubi
->fm_pool
.used
= ubi
->fm_pool
.size
= 0;
965 ubi
->fm_wl_pool
.used
= ubi
->fm_wl_pool
.size
= 0;
968 * fm_pool.max_size is 5% of the total number of PEBs but it's also
969 * between UBI_FM_MAX_POOL_SIZE and UBI_FM_MIN_POOL_SIZE.
971 ubi
->fm_pool
.max_size
= min(((int)mtd_div_by_eb(ubi
->mtd
->size
,
972 ubi
->mtd
) / 100) * 5, UBI_FM_MAX_POOL_SIZE
);
973 if (ubi
->fm_pool
.max_size
< UBI_FM_MIN_POOL_SIZE
)
974 ubi
->fm_pool
.max_size
= UBI_FM_MIN_POOL_SIZE
;
976 ubi
->fm_wl_pool
.max_size
= UBI_FM_WL_POOL_SIZE
;
977 ubi
->fm_disabled
= !fm_autoconvert
;
979 if (!ubi
->fm_disabled
&& (int)mtd_div_by_eb(ubi
->mtd
->size
, ubi
->mtd
)
980 <= UBI_FM_MAX_START
) {
981 ubi_err("More than %i PEBs are needed for fastmap, sorry.",
983 ubi
->fm_disabled
= 1;
986 ubi_msg("default fastmap pool size: %d", ubi
->fm_pool
.max_size
);
987 ubi_msg("default fastmap WL pool size: %d", ubi
->fm_wl_pool
.max_size
);
989 ubi
->fm_disabled
= 1;
991 mutex_init(&ubi
->buf_mutex
);
992 mutex_init(&ubi
->ckvol_mutex
);
993 mutex_init(&ubi
->device_mutex
);
994 spin_lock_init(&ubi
->volumes_lock
);
995 mutex_init(&ubi
->fm_mutex
);
996 init_rwsem(&ubi
->fm_sem
);
998 ubi_msg("attaching mtd%d to ubi%d", mtd
->index
, ubi_num
);
1000 err
= io_init(ubi
, max_beb_per1024
);
1005 ubi
->peb_buf
= vmalloc(ubi
->peb_size
);
1009 #ifdef CONFIG_MTD_UBI_FASTMAP
1010 ubi
->fm_size
= ubi_calc_fm_size(ubi
);
1011 ubi
->fm_buf
= vzalloc(ubi
->fm_size
);
1015 err
= ubi_attach(ubi
, 0);
1017 ubi_err("failed to attach mtd%d, error %d", mtd
->index
, err
);
1021 if (ubi
->autoresize_vol_id
!= -1) {
1022 err
= autoresize(ubi
, ubi
->autoresize_vol_id
);
1027 err
= uif_init(ubi
, &ref
);
1031 err
= ubi_debugfs_init_dev(ubi
);
1035 ubi
->bgt_thread
= kthread_create(ubi_thread
, ubi
, "%s", ubi
->bgt_name
);
1036 if (IS_ERR(ubi
->bgt_thread
)) {
1037 err
= PTR_ERR(ubi
->bgt_thread
);
1038 ubi_err("cannot spawn \"%s\", error %d", ubi
->bgt_name
,
1043 ubi_msg("attached mtd%d (name \"%s\", size %llu MiB) to ubi%d",
1044 mtd
->index
, mtd
->name
, ubi
->flash_size
>> 20, ubi_num
);
1045 ubi_msg("PEB size: %d bytes (%d KiB), LEB size: %d bytes",
1046 ubi
->peb_size
, ubi
->peb_size
>> 10, ubi
->leb_size
);
1047 ubi_msg("min./max. I/O unit sizes: %d/%d, sub-page size %d",
1048 ubi
->min_io_size
, ubi
->max_write_size
, ubi
->hdrs_min_io_size
);
1049 ubi_msg("VID header offset: %d (aligned %d), data offset: %d",
1050 ubi
->vid_hdr_offset
, ubi
->vid_hdr_aloffset
, ubi
->leb_start
);
1051 ubi_msg("good PEBs: %d, bad PEBs: %d, corrupted PEBs: %d",
1052 ubi
->good_peb_count
, ubi
->bad_peb_count
, ubi
->corr_peb_count
);
1053 ubi_msg("user volume: %d, internal volumes: %d, max. volumes count: %d",
1054 ubi
->vol_count
- UBI_INT_VOL_COUNT
, UBI_INT_VOL_COUNT
,
1056 ubi_msg("max/mean erase counter: %d/%d, WL threshold: %d, image sequence number: %u",
1057 ubi
->max_ec
, ubi
->mean_ec
, CONFIG_MTD_UBI_WL_THRESHOLD
,
1059 ubi_msg("available PEBs: %d, total reserved PEBs: %d, PEBs reserved for bad PEB handling: %d",
1060 ubi
->avail_pebs
, ubi
->rsvd_pebs
, ubi
->beb_rsvd_pebs
);
1063 * The below lock makes sure we do not race with 'ubi_thread()' which
1064 * checks @ubi->thread_enabled. Otherwise we may fail to wake it up.
1066 spin_lock(&ubi
->wl_lock
);
1067 ubi
->thread_enabled
= 1;
1068 wake_up_process(ubi
->bgt_thread
);
1069 spin_unlock(&ubi
->wl_lock
);
1071 ubi_devices
[ubi_num
] = ubi
;
1072 ubi_notify_all(ubi
, UBI_VOLUME_ADDED
, NULL
);
1076 ubi_debugfs_exit_dev(ubi
);
1078 get_device(&ubi
->dev
);
1083 ubi_free_internal_volumes(ubi
);
1086 vfree(ubi
->peb_buf
);
1089 put_device(&ubi
->dev
);
1096 * ubi_detach_mtd_dev - detach an MTD device.
1097 * @ubi_num: UBI device number to detach from
1098 * @anyway: detach MTD even if device reference count is not zero
1100 * This function destroys an UBI device number @ubi_num and detaches the
1101 * underlying MTD device. Returns zero in case of success and %-EBUSY if the
1102 * UBI device is busy and cannot be destroyed, and %-EINVAL if it does not
1105 * Note, the invocations of this function has to be serialized by the
1106 * @ubi_devices_mutex.
1108 int ubi_detach_mtd_dev(int ubi_num
, int anyway
)
1110 struct ubi_device
*ubi
;
1112 if (ubi_num
< 0 || ubi_num
>= UBI_MAX_DEVICES
)
1115 ubi
= ubi_get_device(ubi_num
);
1119 spin_lock(&ubi_devices_lock
);
1120 put_device(&ubi
->dev
);
1121 ubi
->ref_count
-= 1;
1122 if (ubi
->ref_count
) {
1124 spin_unlock(&ubi_devices_lock
);
1127 /* This may only happen if there is a bug */
1128 ubi_err("%s reference count %d, destroy anyway",
1129 ubi
->ubi_name
, ubi
->ref_count
);
1131 ubi_devices
[ubi_num
] = NULL
;
1132 spin_unlock(&ubi_devices_lock
);
1134 ubi_assert(ubi_num
== ubi
->ubi_num
);
1135 ubi_notify_all(ubi
, UBI_VOLUME_REMOVED
, NULL
);
1136 ubi_msg("detaching mtd%d from ubi%d", ubi
->mtd
->index
, ubi_num
);
1137 #ifdef CONFIG_MTD_UBI_FASTMAP
1138 /* If we don't write a new fastmap at detach time we lose all
1139 * EC updates that have been made since the last written fastmap. */
1140 ubi_update_fastmap(ubi
);
1143 * Before freeing anything, we have to stop the background thread to
1144 * prevent it from doing anything on this device while we are freeing.
1146 if (ubi
->bgt_thread
)
1147 kthread_stop(ubi
->bgt_thread
);
1150 * Get a reference to the device in order to prevent 'dev_release()'
1151 * from freeing the @ubi object.
1153 get_device(&ubi
->dev
);
1155 ubi_debugfs_exit_dev(ubi
);
1159 ubi_free_internal_volumes(ubi
);
1161 put_mtd_device(ubi
->mtd
);
1162 vfree(ubi
->peb_buf
);
1164 ubi_msg("mtd%d is detached from ubi%d", ubi
->mtd
->index
, ubi
->ubi_num
);
1165 put_device(&ubi
->dev
);
1171 * open_mtd_by_chdev - open an MTD device by its character device node path.
1172 * @mtd_dev: MTD character device node path
1174 * This helper function opens an MTD device by its character node device path.
1175 * Returns MTD device description object in case of success and a negative
1176 * error code in case of failure.
1178 static struct mtd_info
* __init
open_mtd_by_chdev(const char *mtd_dev
)
1180 int err
, major
, minor
, mode
;
1183 /* Probably this is an MTD character device node path */
1184 err
= kern_path(mtd_dev
, LOOKUP_FOLLOW
, &path
);
1186 return ERR_PTR(err
);
1188 /* MTD device number is defined by the major / minor numbers */
1189 major
= imajor(path
.dentry
->d_inode
);
1190 minor
= iminor(path
.dentry
->d_inode
);
1191 mode
= path
.dentry
->d_inode
->i_mode
;
1193 if (major
!= MTD_CHAR_MAJOR
|| !S_ISCHR(mode
))
1194 return ERR_PTR(-EINVAL
);
1198 * Just do not think the "/dev/mtdrX" devices support is need,
1199 * so do not support them to avoid doing extra work.
1201 return ERR_PTR(-EINVAL
);
1203 return get_mtd_device(NULL
, minor
/ 2);
1208 * open_mtd_device - open MTD device by name, character device path, or number.
1209 * @mtd_dev: name, character device node path, or MTD device device number
1211 * This function tries to open and MTD device described by @mtd_dev string,
1212 * which is first treated as ASCII MTD device number, and if it is not true, it
1213 * is treated as MTD device name, and if that is also not true, it is treated
1214 * as MTD character device node path. Returns MTD device description object in
1215 * case of success and a negative error code in case of failure.
1217 static struct mtd_info
* __init
open_mtd_device(const char *mtd_dev
)
1219 struct mtd_info
*mtd
;
1223 mtd_num
= simple_strtoul(mtd_dev
, &endp
, 0);
1224 if (*endp
!= '\0' || mtd_dev
== endp
) {
1226 * This does not look like an ASCII integer, probably this is
1229 mtd
= get_mtd_device_nm(mtd_dev
);
1231 if (IS_ERR(mtd
) && PTR_ERR(mtd
) == -ENODEV
)
1232 /* Probably this is an MTD character device node path */
1233 mtd
= open_mtd_by_chdev(mtd_dev
);
1236 mtd
= get_mtd_device(NULL
, mtd_num
);
1242 static int __init
ubi_init(void)
1249 /* Ensure that EC and VID headers have correct size */
1250 BUILD_BUG_ON(sizeof(struct ubi_ec_hdr
) != 64);
1251 BUILD_BUG_ON(sizeof(struct ubi_vid_hdr
) != 64);
1253 if (mtd_devs
> UBI_MAX_DEVICES
) {
1254 ubi_err("too many MTD devices, maximum is %d", UBI_MAX_DEVICES
);
1258 /* Create base sysfs directory and sysfs files */
1259 ubi_class
= class_create(THIS_MODULE
, UBI_NAME_STR
);
1260 if (IS_ERR(ubi_class
)) {
1261 err
= PTR_ERR(ubi_class
);
1262 ubi_err("cannot create UBI class");
1266 err
= class_create_file(ubi_class
, &ubi_version
);
1268 ubi_err("cannot create sysfs file");
1272 err
= misc_register(&ubi_ctrl_cdev
);
1274 ubi_err("cannot register device");
1278 ubi_wl_entry_slab
= kmem_cache_create("ubi_wl_entry_slab",
1279 sizeof(struct ubi_wl_entry
),
1281 if (!ubi_wl_entry_slab
) {
1286 err
= ubi_debugfs_init();
1291 /* Attach MTD devices */
1292 for (i
= 0; i
< mtd_devs
; i
++) {
1293 struct mtd_dev_param
*p
= &mtd_dev_param
[i
];
1294 struct mtd_info
*mtd
;
1298 mtd
= open_mtd_device(p
->name
);
1301 ubi_err("cannot open mtd %s, error %d", p
->name
, err
);
1302 /* See comment below re-ubi_is_module(). */
1303 if (ubi_is_module())
1308 mutex_lock(&ubi_devices_mutex
);
1309 err
= ubi_attach_mtd_dev(mtd
, p
->ubi_num
,
1310 p
->vid_hdr_offs
, p
->max_beb_per1024
);
1311 mutex_unlock(&ubi_devices_mutex
);
1313 ubi_err("cannot attach mtd%d", mtd
->index
);
1314 put_mtd_device(mtd
);
1317 * Originally UBI stopped initializing on any error.
1318 * However, later on it was found out that this
1319 * behavior is not very good when UBI is compiled into
1320 * the kernel and the MTD devices to attach are passed
1321 * through the command line. Indeed, UBI failure
1322 * stopped whole boot sequence.
1324 * To fix this, we changed the behavior for the
1325 * non-module case, but preserved the old behavior for
1326 * the module case, just for compatibility. This is a
1327 * little inconsistent, though.
1329 if (ubi_is_module())
1337 for (k
= 0; k
< i
; k
++)
1338 if (ubi_devices
[k
]) {
1339 mutex_lock(&ubi_devices_mutex
);
1340 ubi_detach_mtd_dev(ubi_devices
[k
]->ubi_num
, 1);
1341 mutex_unlock(&ubi_devices_mutex
);
1345 kmem_cache_destroy(ubi_wl_entry_slab
);
1347 misc_deregister(&ubi_ctrl_cdev
);
1349 class_remove_file(ubi_class
, &ubi_version
);
1351 class_destroy(ubi_class
);
1353 ubi_err("cannot initialize UBI, error %d", err
);
1356 late_initcall(ubi_init
);
1359 static void __exit
ubi_exit(void)
1366 for (i
= 0; i
< UBI_MAX_DEVICES
; i
++)
1367 if (ubi_devices
[i
]) {
1368 mutex_lock(&ubi_devices_mutex
);
1369 ubi_detach_mtd_dev(ubi_devices
[i
]->ubi_num
, 1);
1370 mutex_unlock(&ubi_devices_mutex
);
1373 kmem_cache_destroy(ubi_wl_entry_slab
);
1374 misc_deregister(&ubi_ctrl_cdev
);
1375 class_remove_file(ubi_class
, &ubi_version
);
1376 class_destroy(ubi_class
);
1378 module_exit(ubi_exit
);
1381 * bytes_str_to_int - convert a number of bytes string into an integer.
1382 * @str: the string to convert
1384 * This function returns positive resulting integer in case of success and a
1385 * negative error code in case of failure.
1387 static int __init
bytes_str_to_int(const char *str
)
1390 unsigned long result
;
1392 result
= simple_strtoul(str
, &endp
, 0);
1393 if (str
== endp
|| result
>= INT_MAX
) {
1394 ubi_err("incorrect bytes count: \"%s\"\n", str
);
1405 if (endp
[1] == 'i' && endp
[2] == 'B')
1410 ubi_err("incorrect bytes count: \"%s\"\n", str
);
1417 int kstrtoint(const char *s
, unsigned int base
, int *res
)
1419 unsigned long long tmp
;
1421 tmp
= simple_strtoull(s
, NULL
, base
);
1422 if (tmp
!= (unsigned long long)(int)tmp
)
1429 * ubi_mtd_param_parse - parse the 'mtd=' UBI parameter.
1430 * @val: the parameter value to parse
1433 * This function returns zero in case of success and a negative error code in
1437 static int __init
ubi_mtd_param_parse(const char *val
, struct kernel_param
*kp
)
1439 int ubi_mtd_param_parse(const char *val
, struct kernel_param
*kp
)
1443 struct mtd_dev_param
*p
;
1444 char buf
[MTD_PARAM_LEN_MAX
];
1445 char *pbuf
= &buf
[0];
1446 char *tokens
[MTD_PARAM_MAX_COUNT
], *token
;
1451 if (mtd_devs
== UBI_MAX_DEVICES
) {
1452 ubi_err("too many parameters, max. is %d\n",
1457 len
= strnlen(val
, MTD_PARAM_LEN_MAX
);
1458 if (len
== MTD_PARAM_LEN_MAX
) {
1459 ubi_err("parameter \"%s\" is too long, max. is %d\n",
1460 val
, MTD_PARAM_LEN_MAX
);
1465 pr_warn("UBI warning: empty 'mtd=' parameter - ignored\n");
1471 /* Get rid of the final newline */
1472 if (buf
[len
- 1] == '\n')
1473 buf
[len
- 1] = '\0';
1475 for (i
= 0; i
< MTD_PARAM_MAX_COUNT
; i
++)
1476 tokens
[i
] = strsep(&pbuf
, ",");
1479 ubi_err("too many arguments at \"%s\"\n", val
);
1483 p
= &mtd_dev_param
[mtd_devs
];
1484 strcpy(&p
->name
[0], tokens
[0]);
1488 p
->vid_hdr_offs
= bytes_str_to_int(token
);
1490 if (p
->vid_hdr_offs
< 0)
1491 return p
->vid_hdr_offs
;
1496 int err
= kstrtoint(token
, 10, &p
->max_beb_per1024
);
1499 ubi_err("bad value for max_beb_per1024 parameter: %s",
1507 int err
= kstrtoint(token
, 10, &p
->ubi_num
);
1510 ubi_err("bad value for ubi_num parameter: %s", token
);
1514 p
->ubi_num
= UBI_DEV_NUM_AUTO
;
1520 module_param_call(mtd
, ubi_mtd_param_parse
, NULL
, NULL
, 000);
1521 MODULE_PARM_DESC(mtd
, "MTD devices to attach. Parameter format: mtd=<name|num|path>[,<vid_hdr_offs>[,max_beb_per1024[,ubi_num]]].\n"
1522 "Multiple \"mtd\" parameters may be specified.\n"
1523 "MTD devices may be specified by their number, name, or path to the MTD character device node.\n"
1524 "Optional \"vid_hdr_offs\" parameter specifies UBI VID header position to be used by UBI. (default value if 0)\n"
1525 "Optional \"max_beb_per1024\" parameter specifies the maximum expected bad eraseblock per 1024 eraseblocks. (default value ("
1526 __stringify(CONFIG_MTD_UBI_BEB_LIMIT
) ") if 0)\n"
1527 "Optional \"ubi_num\" parameter specifies UBI device number which have to be assigned to the newly created UBI device (assigned automatically by default)\n"
1529 "Example 1: mtd=/dev/mtd0 - attach MTD device /dev/mtd0.\n"
1530 "Example 2: mtd=content,1984 mtd=4 - attach MTD device with name \"content\" using VID header offset 1984, and MTD device number 4 with default VID header offset.\n"
1531 "Example 3: mtd=/dev/mtd1,0,25 - attach MTD device /dev/mtd1 using default VID header offset and reserve 25*nand_size_in_blocks/1024 erase blocks for bad block handling.\n"
1532 "Example 4: mtd=/dev/mtd1,0,0,5 - attach MTD device /dev/mtd1 to UBI 5 and using default values for the other fields.\n"
1533 "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device).");
1534 #ifdef CONFIG_MTD_UBI_FASTMAP
1535 module_param(fm_autoconvert
, bool, 0644);
1536 MODULE_PARM_DESC(fm_autoconvert
, "Set this parameter to enable fastmap automatically on images without a fastmap.");
1538 MODULE_VERSION(__stringify(UBI_VERSION
));
1539 MODULE_DESCRIPTION("UBI - Unsorted Block Images");
1540 MODULE_AUTHOR("Artem Bityutskiy");
1541 MODULE_LICENSE("GPL");